Bricked Xiaomi Mi Router 4A Gigabit Edition

Installing and Using OpenWrt
2

Hi, everyone!
I am new for OpenWrt. I think I bricked my xiaomi R4A gigabit Version2 device.
I will need the followings? Could anyone please help directions to obtain those files?

  1. Xiaomi R4A Gigabit V2 (R4AGV2) factory firmware 2.30.20 bin file?
  2. Bootp/tftp-server BootP-DHCP Server ? (this guide)

Please help for directions !
Thank you so much!